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Post subject: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 2:51 pm
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I've had my '00 Twin amp since new, but over the past few months I've been having issues with the slow blow fuse(the one in the back of the amp by the mains lead) as it keeps blowing them when playing at band/live volume. It's never been an issue before so I don't know if it has a more terminal issue.
I'm in the Uk and according to the manual it lists a T2A 250V slow blow fuse, but the back of the amp says it should be a T4A 250V slow blow fuse. The T2A is in there, but should it be a T4A? The info seems conflicting. Has anybody else enountered this issue?
Is it that there is something a little more serious, or is it that I should have the T4A as opposed to the T2A that I have in there?

Any help would be appreciated as this is causing some real issues at practice now!
Cheers, James


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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:13 pm
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Hi JamesG56,

It is a 4A for US domestic (120V), and a 2A for export (230V). Do you have a 120V or 230V version? If the amp says 4A for the fuse, that would indicate a domestic version (120V). It appears that there are also different taps on the transformer for 230V or 240V input, and if using 240V outlet, it does make a difference. :idea:

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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:20 pm
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Both the owner's manual and schematic call for a T2A fuse for UK voltage. If this is a recent occurrance, I suggest you take the amp in for service as it could be indicative of a serious problem affecting the power supply. DO NOT install the higher current T4A fuse.

http://support.fender.com/manuals/guita ... manual.pdf

http://support.fender.com/schematics/gu ... ematic.pdf

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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:21 pm
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James, don't go putting a bigger fuse in your amp, if you are in the UK your amp will be running on 240 Volts?, if so you require half the fuse rating of the same model amp that was specced for the US market on 120 Volts.

If the amp has run fior the last 12 years fine and this has just started happening then you should have the amp looked at by a reliable tech. It could be just a tube starting to fail and on it's way out, drawing too much current when the amp is being pushed at band volume.


Snowy


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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:26 pm
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shimmilou wrote:
Hi JamesG56,

It is a 4A for US domestic (120V), and a 2A for export (230V). Do you have a 120V or 230V version? If the amp says 4A for the fuse, that would indicate a domestic version (120V). It appears that there are also different taps on the transformer for 230V or 240V input, and if using 240V outlet, it does make a difference. :idea:


Schematic shows a T2A for either 230 or 240 volts. Unfortunately, the picture of the back of the amp in the owner's manual I posted to is illegible and impossible to tell what it might say.

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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:27 pm
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No457 Snowy wrote:
don't go putting a bigger fuse in your amp

Snowy


I think we all are in violent agreement on this point. :shock:

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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sun Jun 03, 2012 3:29 pm
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No457 Snowy wrote:
It could be just a tube starting to fail and on it's way out, drawing too much current when the amp is being pushed at band volume.


+1

It could also be an issue with one or more of the diodes in the rectifier circuit, a bad electrolytic cap in the bias or filtering system, a partially-shorted winding in the power tranny, or even something as minor as an arcing on/off switch.

Arjay

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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Mon Jun 04, 2012 1:52 am
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Thank you for all your replies, very helpful.

Don't worry, I wasn't going to start putting different fuses in. It just concerned me when I saw the print on the back of the amp above the fuse holder that stated it should be a T4A. Even though the manual states (as you guys have said) a T2A for Uk market. I wasn't sure which one was the correct one, but wasn't going to start swapping fuses around without confirming as I know what damage can be done by doing so.

But thank you for the info, It looks like I'll have to go with my original plan and take it somewhere to be looked at.

The tremelo also stopped working(seperate occasion to the fuse issue), any body got any thoughts on that? Of course, I will be getting that fixed by the repairer too, I just like to know what the problem is. Curiosity and all that!


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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Mon Jun 04, 2012 2:45 am
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No457 Snowy wrote:
It could be just a tube starting to fail and on it's way out, drawing too much current when the amp is being pushed at band volume.


Thanks for your info in your reply. In regards to any of the valves possibly being their way out, should the indicators on the back of the amp warn you of this? As both the lights are glowing green when the amp is turned on :?


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Post subject: Re: Issue with slow blow fuses in my Twin amp
Posted: Sat Jun 09, 2012 8:25 am
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Well the amp has been taken to a professional for repair. Itching to get it back already. It will be good to get it back in full working order, so I can crank it up and enjoy that tremelo I've been missing for quite some time now


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